I am thinking that the best thing to do is make a patch using a peice of ply (veneer) Find a piece that has grain similar to that around the damaged area. Cut to size, route out the area and glue the patch in.
Not knowing what the top is going on/is on, you could even use a contrasting veneer and do the same thing in matching areas (depending on exact location) that way it looks like it was done on purpose. Make some design to make it decretive.
That should be fine. If your good with color and good with a fine brush you can do this. When you get the patch colored. Put a very very light coat of finish on and let it dry. The next coat can be a bit heavier, and then you should be able to apply the finish as normal. You want to seal this in with very thin fast drying finish so you don't allow the fix to blister or run. Good luckits a bout and 1/8 inch in by about 2 inches long